Two attorneys will handle the lion's share of the arguments before the Supreme Court in the Obama health care reform case. In one corner, US Solicitor General Donald Verrilli. In the other, the indomitable Paul Clement.

Prior to his work in the Obama administration, Mr. Verrilli was a partner at the law firm Jenner & Block, and was co-chairman of the firm's Supreme Court practice. He has argued 16 cases at the high court.

Washington lawyer Paul Clement is no stranger to the podium at the nation's highest court. To date he has argued 55 cases before the justices.

He is representing Florida and 25 other states in their challenge to the constitutionality of the ACA's individual mandate.

Before entering private practice, Mr. Clement served for more than seven years in the US Solicitor General's Office, the last three as solicitor general during the administration of George W. Bush. He is a partner at the Bancroft law firm in Washington.